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Lost as to why there is a tests folder yet the test function marked with the #[test] attribute is being added to /src: https://github.com/rustcoreutils/posixutils-rs/pull/132/comm... edit: Since the change was to the grammar saved in a separate .pest file, which is separated from the procedural code, then would that make the test an integration rather than a unit test as the "parse_program" function is public?

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In Rust, unit tests are marked using the #[test] attribute and typically live alongside the code under test.

Integration tests live under a top-level “tests” folder - in this case, you’ll see that the “tests” directory contains test that call the CLI command and verify its output.

See: https://doc.rust-lang.org/book/ch11-03-test-organization.htm...

The `parse_program` function is public inside the `bc_util::parser` module, and the parser module is marked public inside `bc_util`, but in the `calc/src/bc.rs` file the `bc_util` mod isn't public, and can't be accessed from a test inside the `tests/` folder, which only has access to the public API exported by the library.

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